The nfc function of the mobile phone can identify mahjong with a chip, and the nfc function relies on the magnetic field of the chip to sense the above information.
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You turn on the NFC function of the mobile phone, put the back of the mobile phone close to mahjong, see whether the mobile phone screen will pop up a prompt, if there is a prompt, then the program machine mahjong.
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There is a relatively simple way to test mahjong program machine, you can find a small magnet, mahjong machine installed on the program it must have magnetic powder inside the dice, you use the magnet on the dice plate of the mahjong machine, the dice inside are shaking, then it is mahjong program machine.